Laurel Electronics LTNET485 DIN Rail Mounted Ethernet-to-Serial Device Server - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
LTNET485 DIN Rail Mounted
Ethernet-to-Serial Device Server
Connects up to 31 meters & transmitters to the Ethernet via an RS485 bus
Features
• Interfaces to the Ethernet via an RJ45 jack.
• Mounts to 35 mm DIN rail.
• Universal AC power, 85-264 Vac
• Optional low voltage power, 10-48 Vdc or 12-32 Vac
• Priced at only $150
• DHCP server capability assigns a local IP address to the server
and computer if necessary.
Description
Network with an LTNET485 Ethernet-to-RS485 Device Server
The LTNET485 DIN Rail Ethernet-to-Serial Device Server
provides a 10/100BaseT interface to the Ethernet and serves as
an Ethernet-to-RS485 converter and device server for a mix of up
to 31 Laurel meters and transmitters on an RS485 bus. The
Ethernet connection is via a standard RJ45 jack. The connection
to the RS485 bus can be via an RJ11 jack or via discrete screw
terminals. The lines of the RJ11 jack and the screw terminals are
wired in parallel.
Priced at only $150, the LTNET485 is a very economical and
easy means to interface different types of Laurel transmitters to
an Ethernet LAN and to the Internet. The transmitters can be any
mix of analog input types (voltage, current, AC, DC, strain gauge,
load cell, thermocouple, RTD, ohms) and pulse input types
(frequency, rate, totalizing, quadrature position or rate, period,
elapsed time, sum, difference or ratio of two inputs).
Laurel transmitters come with RS485 I/O as a standard feature
and can be connected to the LTNET485 Device Server using
screws terminals and 3 discrete parallel wires (half-duplex
RS485) or 5 discrete parallel wires (full-duplex RS485), with no
need for a hub. This includes LTA transmitters and LTM
transmitters.
Laurel meters to be connected to the LTNET485 Device Server
need to be equipped with an RS485 option board with dual RJ11
jacks (digital interface ordering option 2). Multiple meters can
then be daisy-chained using readily-available commercial 6-wire
straight-through data cables (not crossover cables), with no need
for a hub.
As an alternative, multiple Laurel meters can be interfaced to a
single Ethernet line via an Ethernet-to-RS485 Converter Board in
one of the meters. That board offers an RJ11 jack for connection
to the RS485 bus as required for meters (like the LTNET485), but
not screw terminal connectors as required for Laurel transmitters
(unlike the LTNET485). Individual Laurel meters equipped with
an Ethernet interface board can also be interfaced to a single
Ethernet line.
Discovery and configuration of Ethernet nodes and their
connected devices can be achieved by two alternate methods
using a PC connected to the same LAN as the Nodes: 1) a
Console mode which uses Windows-based Node Manager
Software, and 2) a Webserver mode which uses a browser to
access the public or private IP address of the node.